Low pass filter-based online generator unit moment of inertia parameter identification method

A generator set and moment of inertia technology, applied in general control systems, instruments, adaptive control, etc., can solve the problems that the dynamic curve cannot be too long and the mechanical power cannot be measured

Active Publication Date: 2015-09-09
BEIJING SIFANG JIBAO AUTOMATION +1
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Problems solved by technology

In order to solve the problem that the mechanical power of the generator shaft system cannot be measured, a method of using a low-pass filter to obtain the mechanical power change curve from the measured electromagnetic power curve in the dynamic identification process is proposed, so as to avoid the failu

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  • Low pass filter-based online generator unit moment of inertia parameter identification method
  • Low pass filter-based online generator unit moment of inertia parameter identification method
  • Low pass filter-based online generator unit moment of inertia parameter identification method

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Embodiment Construction

[0044] The technical solutions of the present invention will be further introduced in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] Such as figure 1 Shown is the flow chart of the online identification method for the moment of inertia of the generator set based on low-pass filtering and considering the change of mechanical torque. The method proposed by the invention is deployed in the advanced application server of the wide-area measurement system of the power grid dispatching center in the actual system, and realizes the identification of the moment of inertia of the generator set by using the real-time measured active output and angular velocity values ​​of the generator set. In order to ensure the accuracy of the online identification results, only the recorded results of the phasor measurement unit PMU during the large disturbance period are used to identify the moment of inertia parameters of the generator set. For the res...

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Abstract

The invention discloses an online generator unit moment of inertia parameter identification method. A feature that the generator unit moment of inertia is a dynamic parameter related to a long-time constant no less than a second level is used, the generator unit moment of inertia is identified only on the basis of a generator motion equation, the phenomenon that a phasor measurement unit can not accurately measure physical quantities during a sub transient process and a transient process can be avoided, and the phenomenon that identification of the moment of inertia is influenced by inaccurate sub transient and transient parameters can be avoided. In view of the problem that generator shafting mechanical power can not be directly measured, a method of using the low-pass filter to acquire a mechanical power change curve from actually-measured electromagnetic power during a dynamic identification process is put forward, errors caused as mechanical power changes are not considered are avoided, and a long-time dynamic curve in the case of identification can be used.

Description

technical field [0001] The invention belongs to the field of generator set parameter identification, in particular to a method for on-line identification of the moment of inertia parameters of the generator set. Background technique [0002] The moment of inertia is one of the most important parameters to characterize the dynamic characteristics of the generating set, and its accuracy has an important impact on the safety and stability analysis of the power system. The moment of inertia of the generator set is determined by the sum of the moments of inertia of the rotating parts of the generator set. For example, for a thermal power unit, the moment of inertia is usually composed of the moment of inertia of the generator set, the moment of inertia of the steam turbine and the moment of inertia of the exciter (except for the generator using a static excitation system). Since these rotating parts may belong to different manufacturers and have complex structures, the moment of...

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Application Information

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IPC IPC(8): G05B13/04
Inventor 段刚李海峰武二克周长江李志学刘今杨东王立鼎秦红霞
Owner BEIJING SIFANG JIBAO AUTOMATION
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